A Ga-Sn liquid metal-mediated structural cathode for Li-O2 batteries
作者：Z. Luo, C. Ji , L. Yin, G. Zhu, B.B. Xu, Y. Wang, T.X. Liu* , X. Zhuge, K. Luo*
關鍵字：Li-O2 batteries, Ga-Sn liquid metal, Flaky Li2O2, Cathode passivation
論文來源：期刊
發表時間：2020年
One of the recent challenges in LieO2 battery technology is the cycle life, which can be severelyshortened by cathode passivation induced by discharge product accumulation; this can be eliminated byreducing the amount of discharge products. Herein, we report a feasibility study on the development of aGaeSn liquid metal (LM)-functionalized multiwalled carbon nanotubes (MWNTs) cathode. In a comparison of MWNT, LM, m-LM/MWNT (pre-mixed LM and MWNTs), and LM/MWNT (LM-modififiedMWNTs) cathodes, morphology analysis showed that small Li2O2 flflakes rather than large crystalsgrow on the conductive GaeSn LM and MWNTs of the LM/MWNT cathode only. The decomposition of theflflaky Li2O2 on the LM/MWNT cathode occurred at lower charge overpotentials, resulting in low polarization; thus, the cathode passivation and the consumption of the Li anode were both alleviated duringthe cyclic process. The LM/MWNT cathode signifificantly improved the cycle life, rate performance, andultimate capacity of Li-O2 batteries.